Extrusion technique for forming polymer preforms, and tube-forming technique
AssigneeKautex Maschinenbau GmbH
InventorsMaurice MIELKE, Michael MÜLLER
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Abstract
Methods, apparatuses, systems, and techniques relate to a tube-forming device for an extruder unit or an extrusion device and a tube-forming process. The tube-forming device comprises at least one shaping sleeve, which is designed to shape a supplied stream of polymer melt from a substantially strand-like cross section into a tubular cross section. The shaping sleeve has a guiding passage embedded in the sleeve wall, such that the guiding passage is a cavity which lies within the sleeve wall and, in the radial direction of the shaping sleeve, is enclosed in a sealed manner with respect to the outer surfaces.
Claims23
A tube-forming device for an extruder unit or an extrusion device, the tube-forming device comprising:
- a shaping sleeve which is designed to shape a supplied stream of polymer melt from a substantially strand-like cross section (QS) into a tubular cross section (QT), wherein the shaping sleeve has a guiding passage embedded in a sleeve wall, such that the guiding passage is a cavity which lies within the sleeve wall and, in a radial direction of the shaping sleeve, is enclosed in a sealed manner with respect to outer surfaces.
An extruder unit for producing preforms with a tube-like wall made of a polymer melt, the extruder unit comprising:
- a dispensing tool with a nozzle body and a mandrel body which can be or is arranged in the nozzle body, wherein, between an inner contour of the nozzle body and an outer contour of the mandrel body, a melt passage (SP) with a tubular cross section (QT) is formed, which leads outward to an annular gap, wherein the extruder unit comprises a tube-forming device.
(canceled)
A tube-forming process for shaping a stream of polymer melt, comprising:
- providing a tube-forming device with at least one shaping sleeve,
- supplying the stream of polymer melt with a substantially strand-like cross section (QS) to an inlet side of the at least one shaping sleeve, characterized by:
- shaping the stream of polymer melt within the at least one shaping sleeve into a tubular cross section (QT), wherein at least one shaping sleeve is designed to shape a supplied stream of polymer melt from a substantially strand-like cross section (QS) into the tubular cross section (QT), wherein the shaping sleeve has a guiding passage embedded in a sleeve wall, such that the guiding passage is a cavity which lies within the sleeve wall and, in a radial direction of the shaping sleeve, is enclosed in a sealed manner with respect to outer surfaces.
Dependencies are inferred from the claim text.